CN114361954B

CN114361954B - Low-voltage switch cabinet

Info

Publication number: CN114361954B
Application number: CN202010209926.7A
Authority: CN
Inventors: 南添; 刘刚; 徐胜; 罗宇敏; 刘毅; 王雷; 南寅; 吴国亮; 朱金保; 刘润; 杨振江
Original assignee: Sooar Tianjin Electrical Equipment Co ltd
Current assignee: Sooar Tianjin Electrical Equipment Co ltd
Priority date: 2020-03-23
Filing date: 2020-03-23
Publication date: 2023-08-08
Anticipated expiration: 2040-03-23
Also published as: CN114361954A

Abstract

A low-voltage switch cabinet comprises a cabinet body, a circuit breaker, three incoming bus bars connected to an outgoing line end of the circuit breaker, and three outgoing bus bars connected to an outgoing line end of the circuit breaker. The three incoming bus bars are connected to the outgoing terminal of the circuit breaker, and extend out of the cabinet body after being bent for several times perpendicularly or horizontally to the panel of the cabinet body; the three outgoing buses are connected to the outgoing terminals of the circuit breaker, are bent vertically or horizontally on the panel of the cabinet body for being switched leftwards or rightwards for upward tilting, and then extend out of the cabinet body after being connected horizontally on the panel of the cabinet body, so that the assembly space of the buses is enlarged, the electric safety distance is increased, the near-pole effect is reduced, the potential safety hazard caused by small electric gaps, which are compact in space and are caused by the same direction in the height direction of the switch cabinet, of the connecting terminals under the circuit breaker is solved, the radiating space of the buses is enhanced, the working temperature in the cabinet is reduced, and the safe and stable operation of the low-voltage switch cabinet is ensured. Compared with similar products, a large number of copper bars are saved, and the economic benefit is remarkable.

Description

Low-voltage switch cabinet

Technical Field

The application relates to the technical field of low-voltage power distribution systems, in particular to a low-voltage switch cabinet.

Background

With the rapid development of society, the demand for electric power energy is increasing, and in the whole power distribution network, the low-voltage switch cabinet plays a role in controlling and distributing electric energy. Widely used in construction, industry, etc. The current realization of high safety and high reliability, and simultaneously, the economical efficiency is the basis of the development of the switch cabinet. However, in the traditional low-voltage incoming line switch cabinet, the common bus trend arrangement is that an incoming line main bus copper bar is led in from the top of the cabinet and is connected to an upper wiring terminal of the circuit breaker through a transfer bus bar; the lower wiring terminal of the circuit breaker is also connected through the transfer busbar, then the three-phase interconnection busbar extends downwards in the height direction of the switch cabinet, is arranged in the depth direction of the switch cabinet according to the back, middle and front of ABC, is connected to the return connection busbar, and then returns to the outgoing line main busbar in the cabinet from the other side of the return connection busbar. When the bus structure is designed, the bus structure is generally logically arranged according to the upper, middle, lower, left, middle, right, far, middle and near of the bus, and the size of the space between the upper wiring terminal and the lower wiring terminal of the circuit breaker and the amount of the input bus are not emphasized. The design of the switch cabinet ensures thermal stability and dynamic stability. The temperature rise in the cabinet is an important index of the performance of the whole switch cabinet, the temperature rise requirement is met on components in the cabinet, and whether the bus can effectively dissipate heat is a problem which cannot be well solved in design. Meanwhile, the dynamic stability is also solved, and the reliability of the structure is required to be ensured under abnormal conditions (short circuit).

As shown in fig. 1, in the scheme 1, a conventional low-voltage incoming switch cabinet 900, an incoming main bus copper bar 910 is introduced from the top of the cabinet, and is connected to an upper vertical connection terminal 930 of the circuit breaker through a switching bus 920; the lower connection terminals 940 of the circuit breaker are connected to the switching busbar connection 950, and the switching busbar 950 is connected to the interconnecting busbar 970 by means of the vertical busbar 960. A. B, C three-phase transfer busbar 950 is arranged in turn in the left middle and right of the switch cabinet, in the depth direction of the switch cabinet in the back middle and front of ABC, while interconnection busbar 970 is arranged in the depth direction in the back middle and front of ABC. Tie busbar 970 is connected to return busbar 980 to the right and from the other side of return busbar 980 to outgoing main busbar 990 in the cabinet. The bus is arranged in the front-back direction to be preferential, so that under the condition of the same cabinet depth, the phase-to-phase distance is smaller, the insulation safety is poor, the bus-bar demand is larger, and the assembly process is complex.

As shown in fig. 2, the improved low-voltage incoming line switch cabinet 800 of scheme 2 is characterized in that an incoming line main bus copper bar 810 is introduced from the top of the cabinet and is directly connected with a horizontal wiring terminal 820 of the circuit breaker; the lower wiring terminal 830 of the circuit breaker is connected with the interconnecting bus 850 through the switching busbar 840, the switching busbar 840 extends downwards in the height direction of the switch cabinet, is arranged in the depth direction of the switch cabinet according to the rear middle front of ABC, and meanwhile, the interconnecting bus 850 is arranged in the depth direction according to the rear middle front of ABC. The tie busbar 850 is connected to the return busbar 860 to the right and from the other side of the return busbar 860 to the main outlet busbar 870 in the cabinet. According to the scheme, through adjusting the terminal direction of the circuit breaker, the switching of the vertical busbar is omitted, the internal resistance of the busbar is reduced, but the busbar is arranged in front and back to be preferential, the inter-phase distance is smaller under the condition of the same cabinet depth, the insulation safety is poor, meanwhile, the busbar demand is not small, and the assembly process is complex.

In order to solve the problems, the structure of the switch cabinet needs to be continuously innovated and perfected, and the safety, reliability and economy of the switch cabinet can be ensured only by the structure.

Disclosure of Invention

The invention aims to solve the following problems:

(1) The traditional low-voltage switch cabinet has the defects that the consumption of copper bars is large and the copper bars are seriously wasted due to the trend layout of buses.

(2) The lower wiring terminal of the traditional low-voltage switch equipment breaker is connected with the bus bars and arranged downwards in the same direction, and the mode easily causes the too small distance between the bus bars, which is not beneficial to heat dissipation of the bus bars.

(3) The traditional low-voltage switch cabinet has smaller distance, and the requirements of electric power on the phase B are higher than those of A and C, so that the extra strength requirement of B is caused.

The above object of the present invention can be achieved by the following technical solutions:

the low-voltage switch cabinet (100) comprises a cabinet body (110), a circuit breaker (200), at least three first buses (300), three second buses (400), at least three third buses (500), at least three fourth buses (600) and at least three fifth buses (700), wherein at least three incoming wire connecting terminals (210) and three outgoing wire connecting terminals (220) which are transversely perpendicular to the upper and lower faces (101) of the cabinet body (110) are arranged at the rear of the circuit breaker (200), at least one section of the face plate (101) which is transversely perpendicular to or transversely sharp to the cabinet body (110) is arranged, and at least one section of the bus (300) which is parallel to the face plate (101) is fixedly connected with the incoming wire connecting terminals (210) and then extends out of the cabinet body (110);

the bus bar (400A) with the side phase transversely perpendicular to the panel (101) is fixedly connected with the wiring terminal (220A), the bus bar (400A) upwards extends to a certain distance with the panel (101) parallel to the cabinet body (110) after connection, is fixedly connected with the bus bar (500A) parallel to the panel (101), extends rightwards after connection, is fixedly connected with the bus bar (600A) which is parallel to the panel (101) and has an acute angle with the panel (101), extends upwards after connection, is fixedly connected with the bus bar (700A) parallel to the panel (101), and extends rightwards outside the cabinet body (110);

a middle phase bus bar (400B) which is transversely perpendicular to the panel (101) is fixedly connected with the outgoing line wiring terminal (220B), a section which extends downwards to be parallel to the panel (101) for 1.5 times as much as the bus bar (400A) upwards and is parallel to the panel (101) is fixedly connected with a bus bar (500B) which is parallel to the panel (101), a section which extends rightwards after connection and is fixedly connected with a section which is parallel to the panel (101) and a section of bus bar (600B) which is in a sharp angle with the panel (101) is fixedly connected with a section of bus bar (700B) which is parallel to the panel (101), and a section which extends rightwards after connection is fixedly connected with the outside of the cabinet body (110);

the bus bar (400C) with the side phase transversely perpendicular to the panel (101) is fixedly connected with the wiring terminal (220C), and extends upwards to be parallel to the panel (101) for a distance after connection, is fixedly connected with the bus bar (500C) provided with the panel (101) with the longitudinal direction perpendicular to the panel and the bus bar (600C) provided with the panel (101) with the section parallel to the panel and the bus bar (700C) with the sharp angle with the panel (101) in a fastening mode, extends upwards to be parallel to the panel (101) in a fastening mode after connection, and extends to the outside of the cabinet body (110) to the right after connection.

Preferably, at least one supporting beam (510) is arranged on the cabinet body (110), at least three groups of bus supporting parts (520A, 520B and 520C) are arranged on the supporting beam (510), a bus supporting part (520A) and a bus supporting part (520C) are arranged on the upper side of the supporting beam (510) and used for fixing a bus (500A) and a bus (500C), and a bus supporting part (520B) is arranged on the lower side of the supporting beam (510) and used for fixing the bus (500B).

The distance between A and B, B and C, C and A are increased, so that the additional loss generated by skin effect and proximity effect is reduced, and finally, the temperature rise effect of the staggered bus system is better than that of the conventional scheme. Specifically, due to the electromotive force f=10 ^- ⁷ I ₁ I ₂ K _h K _c Wherein the section of the copper bar is not changed, so the Kh section coefficient is unchanged, and I is the same ₁ I ₂ The current is also unchanged, but KhThe L in the device is reduced, the distance d is increased, and finally the electrodynamic force is reduced, so that the dynamic stability is superior to that of the conventional scheme.

In conclusion, the structure effectively improves the current carrying capacity of the unit section, so that the current density distribution tends to be more uniform, the cost is further reduced on the premise of ensuring the current carrying, temperature rise and strength, and the scheme has the beneficial effects of reducing materials and improving efficiency.

The beneficial effects of the invention are as follows:

1. the bus bars in the cabinet are far apart and are staggered, the negative influence of the 'proximity effect' is small, the current on the bus bars is uniformly distributed, the heating is reduced, the temperature is raised, and the capacity is improved.

2. The distance between the busbar in the cabinet is far, the three-dimensional space in the cabinet is effectively utilized, the busbar concentration area is not available, the heat dissipation condition is good, the air flow efficiency is high, the heat is easy to dissipate, the temperature rise is low, and the capacity is improved.

3. The busbar is arranged sparsely in the cabinet, the inter-phase and the inter-pole distance are larger, when fault current is encountered, the busbar has a heat dissipation space and electrodynamic force between the busbars is small, the dynamic and thermal stability is good, and the performance of the switch cabinet is improved as a whole.

4. The busbar in the cabinet is connected with the circuit breaker and the busbar structure, wires are arranged in a three-dimensional staggered mode, the length of a copper bar used for connection is effectively shortened, the consumption is reduced, the cost is reduced, and the copper discharge capacity is saved by about 21.3%.

5. The busbar connection structure in the cabinet is simple, the connection links are few, the processing and mounting process is simplified, and the cost is reduced.

Drawings

In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic diagram of a low voltage inlet switchgear of a prior art bus bar system.

Fig. 2 is a schematic diagram of another implementation of a low voltage inlet switchgear of a prior art bus bar system.

Fig. 3 is a schematic diagram of a front isometric view of a low voltage inlet switchgear employing a staggered bus bar system of the present invention.

Fig. 4 is a schematic rear isometric view of a low voltage inlet switchgear employing a staggered bus bar system of the present invention.

Fig. 5 is a schematic diagram illustrating the installation of the circuit breaker 200 and the connecting bus 300 according to the present invention.

Fig. 6A is a schematic diagram of a circuit breaker with a conventional configuration of vertical bus terminals.

Fig. 6B is a schematic structural view of the circuit breaker with the horizontal bus connection terminal according to the present invention.

Fig. 7 is a schematic view of the bus bar system according to the present invention.

FIG. 8 is a schematic diagram of a bus bar system 400A, 500A and 600A according to the present invention.

FIG. 9 is a schematic diagram of a bus bar system 400B, 500B and 600B according to the present invention.

FIG. 10 is a schematic diagram of a bus bar system 400C, 500C and 600C connection according to the present invention.

Detailed Description

Features and exemplary embodiments of various aspects of the invention are described in detail below. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the invention by showing examples of the invention. The present invention is in no way limited to any particular configuration and algorithm set forth below, but rather covers any modification, substitution, and improvement of elements, components, and algorithms without departing from the spirit of the invention.

The structure will now be described in detail with reference to the accompanying drawings:

the references below to "upper", "lower", "left", "right", "vertical", "parallel" are with respect to the angles shown in fig. 7.

As shown in fig. 3 to 10, the present embodiment discloses a low-voltage switch cabinet 100, where the low-voltage switch cabinet 100 includes a cabinet body 110, a circuit breaker 200, at least three first buses 300, at least three second buses 400, at least three third buses 500, at least three fourth buses 600, and at least three fifth buses 700, and the circuit breaker 200, the first buses 300, the second buses 400, the third buses 500, and the fourth buses 600, and the fifth buses 700 are all disposed in the cabinet body 110.

At least three incoming line connection terminals 210 and three outgoing line connection terminals 220 are respectively arranged at the rear of the circuit breaker 200, wherein the incoming line connection terminals 210 and the outgoing line connection terminals are transversely perpendicular to the panel 101 of the cabinet body (110), at least one section of the first bus bar 300 is transversely perpendicular to or transversely sharp-angle-shaped to the panel 101 of the cabinet body 110, at least one section of the first bus bar 300 is parallel to the panel 101, and the first bus bar 300 and the incoming line connection terminals 210 are connected through bolts 13 and then extend out of the cabinet body 110.

The second bus 400 includes a first edge phase bus 400A, a middle phase bus 400B, and a second edge phase bus 400B, the outgoing line connection terminal 200 includes a first outgoing line connection terminal 200A, a second outgoing line connection terminal 200B, and a third outgoing line connection terminal 200C, and the first edge phase bus 400A, the middle phase bus 400B, and the second edge phase bus 400B are respectively disposed corresponding to the first outgoing line connection terminal 200A, the second outgoing line connection terminal 200B, and the third outgoing line connection terminal 200C. Likewise, the third bus bar 500 includes a bus bar 500A, a bus bar 500B, and a bus bar 500C, the fourth bus bar 600 includes a bus bar 600A, a bus bar 600B, and a bus bar 600C, the fifth bus bar 700 includes a bus bar 700A, a bus bar 700B, and a bus bar 700C, the bus bar 500A, the bus bar 600A, and the bus bar 700A are disposed correspondingly, the bus bar 500B, the bus bar 600B, and the bus bar 700B are disposed correspondingly, and the bus bar 500C, the bus bar 600C, and the bus bar 700C are disposed correspondingly.

Specifically, the first side phase bus bar 400A is transversely perpendicular to the panel 101 and connected to the first connection terminal 220A by a bolt L1, and extends upward to have a distance parallel to the panel 101 of the cabinet 110, is connected to the bus bar 500A parallel to the panel 101 by a bolt L2, extends rightward after connection and is connected to a section of bus bar 600A parallel to the panel 101 and having an angle with the panel 101 by a bolt (L3), extends upward after connection and is connected to have a bus bar 700A parallel to the panel 101 by a bolt L4, and extends rightward after connection to the outside of the cabinet 110.

The intermediate phase bus bar 400B having a transverse direction perpendicular to the panel 101 is connected to the second outgoing terminal 220B with a bolt L5, and after connection, extends downward to have a distance parallel to the panel 101 that is 1.5 times as large as the distance that the bus bar 400A extends upward to have a distance parallel to the panel 101, and is connected to the bus bar 500B having a parallel to the panel 101 with a bolt L6, after connection, extends rightward to have a section with a parallel to the panel 101 and a section with a bus bar 600B having an acute angle with the panel 101 with a bolt L7, after connection, extends upward to have a section with a bus bar 700B parallel to the panel 101 with a bolt L8, and after connection, extends rightward to the outside of the cabinet 110. The second side phase bus bar 400C having a transverse direction perpendicular to the panel 101 is connected with the outgoing line connection terminal 220C by the bolt L9, and protrudes upward to be parallel to the panel 101 by a distance after connection, is connected with the bus bar 500C provided with a section having a longitudinal direction perpendicular to the panel 101 and a section having a parallel to the panel 101 by the bolt L10, protrudes rightward after connection and is connected with the bus bar 600C provided with a section parallel to the panel 101 and a section having an acute angle with the panel 101 by the bolt L11, protrudes upward after connection and is connected with the bus bar 700C having a parallel to the panel 101 by the bolt L12, and protrudes rightward after connection to the outside of the cabinet 110.

Preferably, at least one supporting beam 510 is disposed on the cabinet 110, at least three sets of bus bar supporting portions are disposed on the supporting beam 510, the bus bar supporting portions include a bus bar supporting portion 520A, a bus bar supporting portion 520B and a bus bar supporting portion 520C, the bus bar supporting portion 520A and the bus bar supporting portion 520C are disposed on the upper side of the supporting beam 510 and are respectively used for fixing the bus bar 500A and the bus bar 500C, the bus bar supporting portion 520B is disposed on the lower side of the supporting beam 510, and the bus bar supporting portion 520B is used for fixing the bus bar 500B.

As shown in fig. 7, the bus bar 400B of the second bus bar 400 is respectively bent with the bus bar 400A and the bus bar 400C in different directions, so that the distances among the bus bar 400B, the bus bar 400A and the bus bar 400C are increased, the heat flow density is effectively reduced, and the temperature rise is greatly reduced. In the conventional conductor system in series arrangement, the maximum electric power of the B phase is larger than that of the A, C phase, the mechanical strength requirement on the B phase is higher than that of other two phases, and the staggered busbar effectively reduces the electric power and improves the dynamic stability of the power distribution cabinet.

The following are cost analyses and comparisons for different breaker solutions and different low voltage power distribution cabinet solutions:

frame breaker conductive element cost meter of horizontal binding post (3200A for example)

	By copper content	Raw material + electroplating cost	Single dose-4P
				Moving contact	Mass = 1.046 kg surface area = 2.33 square decimeter	76.75	4
Static contact	Mass = 1.028 kg surface area = 2.756 square decimeter	79.56	4
				Slotting tool	Mass = 1.24 kg surface area = 3.01 square decimeter	93.18	8
Bridge type contact	Single contact mass = 0.017 kg surface area = 0.164 square decimeter single phase contact = 60	142.04	8
				Bridge type contact bus	Mass = 1.25 kg surface area = 3.23 square decimeter	95.67	8
Adapter	Mass = 0.692 kg surface area = 2.04 square decimeter	55.20	8
				Cost of raw materials		3713.9 yuan
Processing cost		4103 yuan
				Cost totalization		8509 yuan

	By copper content	Raw material + electricity Cost of plating	For single unit quantity-4P
				Moving contact	Mass = 1.367 kg surface area = 2.6 square decimeter	96.35	4
Static contact	Mass = 1.184 kg surface area = 2.316 square decimeter	84.02	4
				Slotting tool	Without any means for	0.00	0
Bridge type contact	Contact sheet single 1) mass on contact sheet = 8.25 grams; surface area = 0.098 square decimeter. 2) Contact piece lower mass = 7.92 grams; surface area = 0.0825 flat Square decimeter. 3) Cord = 30 square _37.5mm long, single phase contact = 28.	97.03	8
				Bridge type contact Bus bar	Mass = 1.051 kg surface area = 2.23 square decimeter	76.13	8
Adapter	Without any means for	0.00	0
				Raw material forming The book is provided with		2106.7 yuan
Processing cost		2106. Meta
				Cost totalization		4092 yuan

Each raw material saves 30 kg of copper material, the market price is 1608 yuan, the 3200A product accounts for 20% according to the 10-ten-thousand frame circuit breaker with the Chinese market demand, the copper raw material is saved by 60 tons, and the market value is 3000 ten-thousand yuan. The full-frame circuit breaker adopts the scheme to realize copper saving of 300 tons and market value of 1.5 hundred million yuan.

Single bus cost analysis for low-voltage complete cabinet

	Scheme 1	Conventional scheme 2	Staggered bus bar scheme
				Bus bar weight	263.67kg	231.44kg	207.57kg
Cost of raw materials	14130 yuan	12402 yuan	11123 yuan

The bus bar scheme of staggered arrangement saves 56kg of copper materials compared with the national net scheme, the saving rate is 21.3%, and each saving is 3007 yuan. According to the 10-ten-thousand frame circuit breaker with the Chinese market demand, the 3200A product accounts for 20 percent, the copper raw material is saved by 112 tons, and the market value is 5936 ten-thousand yuan. The full-frame circuit breaker adopts the scheme to realize the copper saving of 560 tons and the market value of 2.96 hundred million yuan.

Note that: copper part and electroplating price table:

the structure effectively improves the current carrying capacity of the unit section, makes the current density distribution more uniform, further reduces the cost on the premise of ensuring the current carrying, temperature rise and strength, and has the beneficial effects of reducing materials and improving efficiency.

The present application may be embodied in other specific forms without departing from its spirit or essential characteristics. The present embodiments are to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Claims

1. The low-voltage switch cabinet (100) is characterized by comprising a cabinet body (110), a circuit breaker (200), at least three first buses (300), three second buses (400), at least three third buses (500), at least three fourth buses (600) and at least three fifth buses (700), wherein at least three wire inlet wiring terminals (210) and three wire outlet wiring terminals (220) which are transversely perpendicular to the upper and lower wire inlet wiring terminals (210) of a panel (101) of the cabinet body (110) are arranged at the rear of the circuit breaker (200), at least one section of the panel (101) which is transversely perpendicular to or transversely sharp-angled to the cabinet body (110) and at least one section of the panel (101) which is parallel to the panel (101) are fixedly connected with the wire inlet wiring terminals (210) and then extend out of the cabinet body (110);

the bus bar (400A) with the side phase transversely perpendicular to the panel (101) is fixedly connected with the wiring terminal (220A), the panel (101) with the side phase parallel to the cabinet body (110) stretches upwards after connection to a certain distance, the bus bar (500A) with the side phase parallel to the panel (101) is fixedly connected with the bus bar (500A) with the side phase parallel to the cabinet body (110), at least one section of the panel (101) with the side phase parallel to the cabinet body (110) stretches out leftwards or rightwards after connection and at least one section of the bus bar (600A) with the side phase in an acute angle with the panel (101) is fixedly connected with the bus bar (700A) with the side phase parallel to the panel (101), and the bus bar (700A) with the side phase parallel to the panel (101) stretches leftwards or rightwards after connection to the outside of the cabinet body (110);

a middle phase bus bar (400B) which is transversely perpendicular to the panel (101) is fixedly connected with the outgoing line wiring terminal (220B), the middle phase bus bar (400B) is downwards connected with the bus bar (500B) which is parallel to the panel (101) by a distance which is at least 1.5 times that of the bus bar (400A) and upwards parallel to the panel (101), at least one section of bus bar (600B) which is parallel to the panel (101) and at least one section of bus bar (600B) which is in an acute angle with the panel (101) are arranged and fixedly connected with the bus bar (700B) which is parallel to the panel (101), and the middle phase bus bar (400B) is downwards connected with the bus bar (500B) which is parallel to the panel (101) and upwards or rightwards extends to the outside of the cabinet body (110);

an edge phase busbar (400C) which is transversely perpendicular to the panel (101) is fixedly connected with the outgoing line wiring terminal (220C), and extends upwards to be parallel to the panel (101) for a certain distance after connection, is fixedly connected with at least one section of busbar (500C) which is longitudinally perpendicular to the panel (101) and at least one section of busbar (500C) which is parallel to the panel (101), extends leftwards or rightwards after connection, is fixedly connected with at least one section of busbar (600C) which is parallel to the panel (101) and at least one section of busbar (600C) which is in an acute angle with the panel (101), extends upwards after connection, is fixedly connected with the busbar (700C) which is parallel to the panel (101), and extends leftwards or rightwards after connection to the outside of the cabinet body (110).

2. The low-voltage switch cabinet according to claim 1, wherein at least one supporting beam (510) is arranged on the cabinet body (110), at least three groups of bus bar supporting parts (520A, 520B and 520C) are arranged on the supporting beam (510), bus bar supporting parts (520A) and bus bar supporting parts (520C) are arranged on the upper side of the supporting beam (510) and used for fixing bus bars (500A) and bus bars (500C), and bus bar supporting parts (520B) are arranged on the lower side of the supporting beam (510) and used for fixing bus bars (500B).